Faires, J. D., & DeFranza, J. (1997). Precalculus. Brooks/Cole.
Cita Chicago (17th ed.)Faires, J. Douglas, i James DeFranza. Precalculus. Pacific Grove, CA: Brooks/Cole, 1997.
Cita MLA (9th ed.)Faires, J. Douglas, i James DeFranza. Precalculus. Brooks/Cole, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.